[RHSA-2016:1814-01] Important: kernel security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2016:1814-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1814.html

Issue date: 2016-09-06

CVE Names: CVE-2016-4565 CVE-2016-5696

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1. Summary:

 

An update for kernel is now available for Red Hat Enterprise Linux 6.5

Advanced Update Support.

 

Red Hat Product Security has rated this update as having a security impact

of Important. A Common Vulnerability Scoring System (CVSS) base score,

which gives a detailed severity rating, is available for each vulnerability

from the CVE link(s) in the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Server AUS (v. 6.5) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64

 

3. Description:

 

The kernel packages contain the Linux kernel, the core of any Linux

operating system.

 

Security Fix(es):

 

* A flaw was found in the way certain interfaces of the Linux kernel's

Infiniband subsystem used write() as bi-directional ioctl() replacement,

which could lead to insufficient memory security checks when being invoked

using the splice() system call. A local unprivileged user on a system with

either Infiniband hardware present or RDMA Userspace Connection Manager

Access module explicitly loaded, could use this flaw to escalate their

privileges on the system. (CVE-2016-4565, Important)

 

* It was found that the RFC 5961 challenge ACK rate limiting as implemented

in the Linux kernel's networking subsystem allowed an off-path attacker to

leak certain information about a given connection by creating congestion on

the global challenge ACK rate limit counter and then measuring the changes

by probing packets. An off-path attacker could use this flaw to either

terminate TCP connection and/or inject payload into non-secured TCP

connection between two endpoints on the network. (CVE-2016-5696, Important)

 

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565 and Yue

Cao (Cyber Security Group of the CS department of University of California

in Riverside) for reporting CVE-2016-5696.

 

Bug Fix(es):

 

* After upgrading the kernel, CPU load average increased compared to the

prior kernel version due to the modification of the scheduler. The provided

patchset makes the calculation algorithm of this load average roll back to

the status of the previous system version thus resulting in relatively

lower values in the same system load. (BZ#1343010)

 

4. Solution:

 

For details on how to apply this update, which includes the changes

described in this advisory, refer to:

 

https://access.redhat.com/articles/11258

 

The system must be rebooted for this update to take effect.

 

5. Bugs fixed (https://bugzilla.redhat.com/):

 

1310570 - CVE-2016-4565 kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko

1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.

 

6. Package List:

 

Red Hat Enterprise Linux Server AUS (v. 6.5):

 

Source:

kernel-2.6.32-431.73.2.el6.src.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-431.73.2.el6.noarch.rpm

kernel-doc-2.6.32-431.73.2.el6.noarch.rpm

kernel-firmware-2.6.32-431.73.2.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debug-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debug-devel-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-431.73.2.el6.x86_64.rpm

kernel-devel-2.6.32-431.73.2.el6.x86_64.rpm

kernel-headers-2.6.32-431.73.2.el6.x86_64.rpm

perf-2.6.32-431.73.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional AUS (v. 6.5):

 

Source:

kernel-2.6.32-431.73.2.el6.src.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-431.73.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

python-perf-2.6.32-431.73.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-431.73.2.el6.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2016-4565

https://access.redhat.com/security/cve/CVE-2016-5696

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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